What is the easiest procedure to replace a failed boot drive in a Windows software RAID1?

I have an HP ML350 with two 1TB Hot Plug SATA hard drives.  It's running Windows Server 2008R2 with a software RAID 1 and Disc 0 has failed.  It will randomly allow me to boot to the bad drive, but only stays online for about 5 minutes and shuts down.  This is the only customer I have who uses software RAID instead of hardware RAID, so I'm not familiar with it's functionality.  I have a new identical replacement 1TB hard drive, but would like some guidance for replacing this before I go onsite.  Could someone give me step by step instructions?

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Remove the bad disk and the boot menu should show you an option to boot to the other disk. Just boot to that disk and the server should run fine. When you install the new disk, just go into diskmanagement and add it to the array.

As always, make sure your backups are all fine so you can restore from them should anything go wrong. If necessary do a separate backup before anything else.

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PRAISE2Author Commented:
Thank you for the suggestion rindi.  Turns out the disc I thought was good had too many bad sectors to re-mirror, so I'm doing a reload and restore from backup.
For the future regularly watch the state of the disks, and I also suggest to plan some maintenance days during weekends, when you shutdown and clean the server, and also run chkdsk so any file-system corruptions are repaired.
PRAISE2Author Commented:
I agree and I do this for my customers who have support contracts with me.  This particular customer declined our support & monitoring service and choose to "pay on a per incident basis".
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